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<h2>
<span class="refentrytitle">mac</span>
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<p>mac —
Multiplies and accumulates a- and k-rate signals.
</p>
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<div class="refsect1" title="Description">
<a id="idp30069056"></a>
<h2>Description</h2>
<p>
Multiplies and accumulates a- and k-rate signals.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp30069720"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>mac</strong></span> ksig1, asig1 [, ksig2] [, asig2] [, ksig3] [, asig3] [...]</pre>
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<div class="refsect1" title="Performance">
<a id="idp30073080"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ksig1, etc.</em></span> -- k-rate input signals
</p>
<p>
<span class="emphasis"><em>asig1, etc.</em></span> -- a-rate input signals
</p>
<p>
<span class="emphasis"><em>mac</em></span> multiplies and accumulates a- and k-rate signals. It is equivalent to:
</p>
<div class="literallayout">
<p><br />
ares = asig1*ksig1 + asig2*ksig2 + asig3*ksig3 + ...<br />
</p>
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<p>
</p>
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<div class="refsect1" title="Examples">
<a id="idp30075360"></a>
<h2>Examples</h2>
<p>
Here is an example of the mac opcode. It uses the file <a class="ulink" href="examples/mac.csd" target="_top"><em class="citetitle">mac.csd</em></a>. It is written for *NIX systems, and will generate errors on Windows.
</p>
<div class="example">
<a id="idp30126600"></a>
<p class="title">
<strong>Example 432. Example of the mac opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if real audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o mac.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1 <span class="comment">;4 band equalizer</span>
klow <span class="op">=</span> p4 <span class="comment">;low gain1</span>
klmid <span class="op">=</span> p5 <span class="comment">;low gain2 </span>
kmidh <span class="op">=</span> p6 <span class="comment">;high gain1</span>
khigh <span class="op">=</span> p7 <span class="comment">;high gain2</span>
ifn <span class="op">=</span> p8 <span class="comment">;table</span>
ilc1 <span class="opc">table</span> 0, ifn <span class="comment">;low freqency range</span>
ilc2 <span class="opc">table</span> 1, ifn <span class="comment">;low-mid</span>
ihc1 <span class="opc">table</span> 2, ifn <span class="comment">;mid-high</span>
ihc2 <span class="opc">table</span> 3, ifn <span class="comment">;high</span>
asig <span class="opc">diskin2</span> "fox.wav", 1
alow1 <span class="opc">butterlp</span> asig, ilc1 <span class="comment">;lowpass 1</span>
almid <span class="opc">butterlp</span> asig, ilc2 <span class="comment">;lowpass 2</span>
amidh <span class="opc">butterhp</span> asig, ihc1 <span class="comment">;highpass 1</span>
ahigh <span class="opc">butterhp</span> asig, ihc2 <span class="comment">;highpass 2</span>
aout <span class="opc">mac</span> klow, alow1, klmid, almid, kmidh, amidh, khigh, ahigh
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 4 -2 150 300 600 5000
<span class="stamnt">f</span>2 0 4 -2 75 500 1000 10000
<span class="stamnt">f</span>3 0 4 -2 200 700 1500 3000
<span class="comment">; low lowmid midhigh high table </span>
<span class="stamnt">i</span> 1 0 2.8 2 1 1 1 1
<span class="stamnt">i</span> 1 3 2.8 2 3 1 1 2
<span class="stamnt">i</span> 1 6 2.8 2 1 2 3 3
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp30128816"></a>
<h2>See Also</h2>
<p>
<a class="link" href="maca.html" title="maca"><em class="citetitle">maca</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp30129832"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath, Codemist, Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>May 1999</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.54</p>
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